Add disposables to context.subscriptions

[xorye]

This PR adds disposables to context.subscriptions instead of a separate array that is manually disposed of in the deactivate() function.

The contents of context.subscriptions are automatically disposed of when the extension is deactivated. Source

Signed-off-by: David Kwon dakwon@redhat.com

[xorye]

And notably, this PR deals with the debug.onDidTerminateDebugSession disposable properly.

Instead of doing:
disposables.push(debug.onDidTerminateDebugSession(() => {}, null, disposables));

this PR does:
context.subscriptions.push(debug.onDidTerminateDebugSession(() => {}));